78' FRIEDMAN KS JMP 2203

[JMP/HBE]

 

[MetalManiac]

Re: 78' FRIEDMAN KS JMP 2203

THIS is the sound I hear in my brane when I think of hot rod Marshall. Best clip I ever heard. I'm not gonna modify my stock '78 JMP though. I emailed Mr. Dave F. about 5 years ago and he said he would modify my Traynor, but I don't think it would sound as good as this one you posted, so probably would just use a good tube preamp with it- they make some good ones now. Thank you for this clip;

 

[JMP/HBE]

Re: 78' FRIEDMAN KS JMP 2203

THIS is the sound I hear in my brane when I think of hot rod Marshall. Best clip I ever heard. I'm not gonna modify my stock '78 JMP though. I emailed Mr. Dave F. about 5 years ago and he said he would modify my Traynor, but I don't think it would sound as good as this one you posted, so probably would just use a good tube preamp with it- they make some good ones now. Thank you for this clip;

Wow thanks man ! I research for 2 years all the Builders, kept coming back to Dave because his mods still had the base tone of a Marshall just enhanced. I had several chats wit Santiago Alverez Marshalls former lead Engineer, but i was on the fence. He knew Dave, had visited his shop and finally said to me "WTF man its just an amp". I had other JMP's at the time so i took the plunge in 2011 and never looked back. Ive never had one issue with this amp the last 7 years and i can't believe its been that long already. Can't recommend Dave highly enough, he made me the amp of my dreams.

 

[InbredJunk]

Re: 78' FRIEDMAN KS JMP 2203

Care to disclose the details of cost? I'm looking for a jmp and I'd absolutely love one modded by Mr. Friedman.

I'm not saying I'd buy yours, just wondering what ya got in it.

 

[JMP/HBE]

Re: 78' FRIEDMAN KS JMP 2203

Care to disclose the details of cost? I'm looking for a jmp and I'd absolutely love one modded by Mr. Friedman.

I'm not saying I'd buy yours, just wondering what ya got in it.

$1400 for the Stock JMP & about $1K for the mods including shipping. Reasonable IMO.

 

[InbredJunk]

Re: 78' FRIEDMAN KS JMP 2203

$1400 for the Stock JMP & about $1K for the mods including shipping. Reasonable IMO.

Very reasonable. Is there a particular jmp to look for, or will any of the mid to late 70s do?

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[Ayrton]

Re: 78' FRIEDMAN KS JMP 2203

Before Dave really got his own line of amps off the ground, having your Marshall modded was the next best thing.

However, if you don't already have the Marshall, why not spend the $2500 on a used BE-100?

 

[JMP/HBE]

Re: 78' FRIEDMAN KS JMP 2203

Very reasonable. Is there a particular jmp to look for, or will any of the mid to late 70s do?

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1978' Model 2203 & 2204 {100 & 50 watt} were the first year to have Cascaded Preamps that used V1 & V2 for gain. Before that it was just V1. 78' is my favorite year but any after 78' to 81' would be good. 1981 JCM-800's {first year} would be a close second but i prefer the JMP's. Ive had them all.
Dave Friedman is a good guy and will take care of you but you gotta be patient. my mods took 3 months and he answers emails & his phone @ Rack Systems. My mods were done in 2011.
Shoot him an email. Sometimes he stops taking amps for a little bit to get caught up, he personally tests & signs off on every one of his new FRIEDMAN amps so he's a busy guy.
RACKSYSTEMS@yahoo.com

 

[InbredJunk]

Re: 78' FRIEDMAN KS JMP 2203

1978' Model 2203 & 2204 {100 & 50 watt} were the first year to have Cascaded Preamps that used V1 & V2 for gain. Before that it was just V1. 78' is my favorite year but any after 78' to 81' would be good. 1981 JCM-800's {first year} would be a close second but i prefer the JMP's. Ive had them all.

Awesome. Thanks for your knowledge sir!

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[JMP/HBE]

Re: 78' FRIEDMAN KS JMP 2203

I edited my last post with contact info.

 

[InbredJunk]

Re: 78' FRIEDMAN KS JMP 2203

I edited my last post with contact info.

Thanks a bunch. Now gotta find a jmp!

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[JMP/HBE]

Re: 78' FRIEDMAN KS JMP 2203

Thanks a bunch. Now gotta find a jmp!

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https://reverb.com/shop/acmeguitars?product_type=amps This guy has several. He has my old 1981' JCM-800 too, mint condition. Don't let the prices scare you, he negotiates.

 

[InbredJunk]

Re: 78' FRIEDMAN KS JMP 2203

https://reverb.com/shop/acmeguitars?product_type=amps This guy has several. He has my old 1981' JCM-800 too, mint condition. Don't let the prices scare you, he negotiates.

Well that's awesome, he's right up the road from me

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[dystrust]

Re: 78' FRIEDMAN KS JMP 2203

1978' Model 2203 & 2204 {100 & 50 watt} were the first year to have Cascaded Preamps that used V1 & V2 for gain. Before that it was just V1.

I'm pretty sure you mean V1A & V1B as opposed to V1 & V2. NMV Marshalls run V1A & V1B in parallel with one side used for the bright channel and the other used for the normal channel. The first JMP 2203/2204s from '75 and '76 may have continued to run the stages in parallel with differing sensitivity for each input (I honestly can't remember how they worked), but the familiar cascaded V1A & V1B preamp started in '77. With this preamp, the low input bypasses the first gain stage and only runs through V1B. In all of these early Marshalls V2 is the cathode follower rather than a gain stage. After '77 the next major change happened in '85 with horizontal inputs, board-mounted pots, EL-34s instead of 6550s (US market only) and reduced power supply filtering (2203 only).

 

[Lake Placid Blues]

Re: 78' FRIEDMAN KS JMP 2203

I'm pretty sure you mean V1A & V1B as opposed to V1 & V2. NMV Marshalls run V1A & V1B in parallel with one side used for the bright channel and the other used for the normal channel. The first JMP 2203/2204s from '75 and '76 may have continued to run the stages in parallel with differing sensitivity for each input (I honestly can't remember how they worked), but the familiar cascaded V1A & V1B preamp started in '77. With this preamp, the low input bypasses the first gain stage and only runs through V1B. In all of these early Marshalls V2 is the cathode follower rather than a gain stage. After '77 the next major change happened in '85 with horizontal inputs, board-mounted pots, EL-34s instead of 6550s (US market only) and reduced power supply filtering (2203 only).

V2a is a voltage amplifier in both plexis and 2203 circuits i believe. It ups the gain but doesn't clip, or if it does not very much. V2b is the cathode follower or the input to the tone stack is taken from the cathode of V2b.

There is something else going on with the 77 circuit revision on the master volume amps that should be pointed out, and which is germane to the later modded Marshall amps of the 80s by Jose and others that the BE type amps owes their legacy. The cathode resistor of V1B has been increased to 10k. To put this into perspective the shared cathode resistor on a 59 bassman is only 820 ohms. This makes the bias of V1B colder which causes it to clip the negative side of the signal earlier than the positive side as its being overdriven by V1A cascading into it. This causes an asymmetric clip. Asymmetric clipping is very organic and tubey sounding because it enhances even order harmonics.

This little trick was not new to Marshall. On the split cathode plexis the cathode resistor for the lead channel had been increased from 820 ohms to 1.8k to set up some asymmetric clipping and/or compression, especially if there was a boost pedal in front of the amp.

With an extra tube often added to modded Marshalls during the 80s, it was common practice to set up these extra gain stages to provide even more asymmetric clipping. For example, the Soldano SLO uses plexi value cathode resistors through the first two stages of the overdrive channel, but then V2B comes next. V2B is set up, not with a 10k cathode resistor like a 2203's V1B, but with a whopping 39k resistor. This "cold clipper" sets up a massive amount of asymmetric clipping. This topology was copied exactly by the Rectifier amps and the 5150s ...ect...

 

[JMP/HBE]

Re: 78' FRIEDMAN KS JMP 2203

V2a is a voltage amplifier in both plexis and 2203 circuits i believe. It ups the gain but doesn't clip, or if it does not very much. V2b is the cathode follower or the input to the tone stack is taken from the cathode of V2b.

There is something else going on with the 77 circuit revision on the master volume amps that should be pointed out, and which is germane to the later modded Marshall amps of the 80s by Jose and others that the BE type amps owes their legacy. The cathode resistor of V1B has been increased to 10k. To put this into perspective the shared cathode resistor on a 59 bassman is only 820 ohms. This makes the bias of V1B colder which causes it to clip the negative side of the signal earlier than the positive side as its being overdriven by V1A cascading into it. This causes an asymmetric clip. Asymmetric clipping is very organic and tubey sounding because it enhances even order harmonics.

This little trick was not new to Marshall. On the split cathode plexis the cathode resistor for the lead channel had been increased from 820 ohms to 1.8k to set up some asymmetric clipping and/or compression, especially if there was a boost pedal in front of the amp.

With an extra tube often added to modded Marshalls during the 80s, it was common practice to set up these extra gain stages to provide even more asymmetric clipping. For example, the Soldano SLO uses plexi value cathode resistors through the first two stages of the overdrive channel, but then V2B comes next. V2B is set up, not with a 10k cathode resistor like a 2203's V1B, but with a whopping 39k resistor. This "cold clipper" sets up a massive amount of asymmetric clipping. This topology was copied exactly by the Rectifier amps and the 5150s ...ect...

Agreed, you are Wise in the ways of Toan ...